and in the paint method of the ItemDelegate i set the Qlable to render like this :
@pTextEdit_title->setText(Title);
QRect TextEditRect(option.rect.x()+THUMB_WIDTH+THUMB_WIDTH+PADDING, option.rect.y() ,
pTextEdit_title->width(), pTextEdit_title->height());
QPixmap pixmap(pTextEdit_title->size());
pTextEdit_title->render(&pixmap);
painter->drawPixmap(TextEditRect,pixmap);
@

it render the QLable file , but the problem is that it has gray background and dosnt act as transparent background , my question is how to set the QLable background to be transparent?